In an earlier contribution to this discussion,
John Andrews wrote:

Dear all

I have a conventional heating system, comprising an Ideal gas boiler,
with gravity flow and return (hot water circuit) and pumped flow and
return (central heating circuit).

I'm getting no hot water out of the taps at present, central heating
is ok.
Can anyone advise me on how to fix this please?

Thermostat on boiler is ok, and the control panel is asking for hot
water as it should. The gravity flow pipe from the boiler is not
heating up. So I guess it might be the heat exhanger that's the
problem?

Yours in hope
John

Does the CH use entirely separate pipes from the HW, connected to the
opposite side of the boiler?

Do you have a small fill & expansion tank in the attic, with pipes connected
into the HW circuit? Does it have any water in it?

There is a possibility that the ball valve may have stuck, allowing the
level to drop through evaporation/leaks etc. to the point where there's an
air lock in the HW circuit.

If this is the case, freeing the ball valve should fix it.

Failing that, are there any controls on the HW circuit - such as a motorised
valve driven by a cylinder stat to stop the HW from getting too hot?
--
Cheers,
Set Square
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